以太坊（10）go-ethereum开发环境 + mist + solidity实现代币（管理、增发、兑换、冻结） –mac

最近比较忙，go-ethereum的代码没时间分享了，后续我会持续更新。

之前分享了基于erc2.0发布简单的 虚拟代币实例：

https://blog.csdn.net/weixin_41806245/article/details/80297406

本章基之前发布的文章 go-ethereum + mist 开发环境搭建：

https://blog.csdn.net/weixin_41806245/article/details/80472300

本章目的：

实现虚拟代币的管理、增发、兑换、冻结等；

开发准备：

1. 启动geth 私有链；

2. 启动mist 连接启动的私有链；

1、2 过程不在多说前面有文章介绍，1过程你可以使用ganache当测试链、可以使用以太坊的测试网络；

编写代码：

整个代码文件如下：

pragma solidity ^0.4.18;

contract owned{
    address public owner;

    function owned() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }
    // 修改拥有者
    function transferOwner(address newOwner) public onlyOwner {
        owner = newOwner;
    }
}


contract xiliangMaCoin is owned {
    string public name = "xiliangMaCoin"; //代币名称
    string public symbol = "XLMC"; //简称
    uint8 public decimals = 4; //最小单位
    uint256 public INITIAL_SUPPLY = 1000000000; //代币发行总量
    uint public sellPrice = 1 ether; //卖出价格
    uint public buyPrice = 1 ether; //购买价格

    mapping(address => uint) public balanceOf;
    mapping(address => bool) public frozenAccount;
    // 将代币初始化给用户
    function xiliangMaCoin() public {
        balanceOf[msg.sender] = INITIAL_SUPPLY;
    }
    // 代币增发，正常情况下是不允许的，简单写个例子表达下
    function mintToken(address target, uint mintedAmount) public onlyOwner {
        if (target == 0) revert();
        balanceOf[target] += mintedAmount;
        INITIAL_SUPPLY += mintedAmount;
    }
    // 冻结账户
    function frozeAccount(address target, bool isFrozen) public onlyOwner {
        if (target == 0) revert();
        frozenAccount[target] = isFrozen;
    }
    // 定义事件
    event Transfer(address from, address to, uint amount);
    // 代币的转移
    function transfer(address to, uint value) public {
        if (frozenAccount[msg.sender]) revert();
        if (balanceOf[msg.sender] < value) revert();
        if ((balanceOf[to] + value) < balanceOf[to]) revert();

        balanceOf[msg.sender] -= value;
        balanceOf[to] += value;
    }
    // 设置代币的价格
    function setPrice(uint newSellPrice, uint newBuyPrice) public onlyOwner {
        sellPrice = newSellPrice;
        buyPrice = newBuyPrice;
    }
    // 卖代币，并返回获得的收益
    function sell(uint amount) public returns (uint revenue) {
        if (frozenAccount[msg.sender]) revert();
        require(balanceOf[msg.sender] >= amount);
        balanceOf[owner] += amount;
        balanceOf[msg.sender] -= amount;
        revenue = amount * sellPrice;
        msg.sender.transfer(revenue);
        emit Transfer(msg.sender, owner, amount);
        return revenue;
    }
    // 根据购买者持有的以太币，计算能购买的代币数并购买
    function buy() payable public returns(uint amount){
        amount = msg.value / buyPrice;
        require(balanceOf[owner] >=  amount);
        balanceOf[owner] -= amount;
        balanceOf[msg.sender] += amount;
        emit Transfer(owner, msg.sender, amount);
        return amount;
     }

}

部署合约：

使用mist部署合约，之前很少介绍mist主要想给大家介绍熟悉truffle部署测试、这次咱们偷懒；

1. 点击合约 --》选择部署合约